Shifty Posted September 15, 2018 Report Share Posted September 15, 2018 1st. What would be the best non synthetic gear oils to use. And what weight did the 8.8s come with normally. Next would be what seems to be the difference between these 2 kits, minus the high torque bearing. Is that a recommended thing for our rears? https://www.americanmuscle.com/frpp-88-pinion-kit-8614v8.html -- Ford # M-4210-B2 https://www.americanmuscle.com/frpp-88-pinion-kit-8604.html --- Ford # M-4210-C3 Link to comment Share on other sites More sharing options...
Blackmage Posted December 26, 2018 Report Share Posted December 26, 2018 pretty sure the diff's had 80w90 in them from the factory. XY-80W90-QL is the motorcraft product number for it. the high torque kit does NOT come with axle bearings like the standard kit. I dont think you need the high torque bearing, but cant hurt either. Link to comment Share on other sites More sharing options...
